(a) Electrostatic precipitator.
(b) This is an important equipment which is used to remove particulate matter like soot and dust present in industrial exhaust. It is capable of removing almost 99% particulate matter present in exhaust of a thermal power plant.
(c) (1) In Electrostatic precipitator, high voltage is applied which produces electric discharge.
(2) This discharge causes ionisation of air in the smokestack.
(3) As a result, the free electrons are formed.
(4) These electrons in the ionised air attach to the gaseous or dust particles moving up the stack.
(5) Negatively charged particles move towards the positive electrode and settle down there.
(6) They are then removed by vibrations of the electrodes and collected in the reservoir.
